Safety razor sharpener and razor blade

thingiverse

You see, this is just a basic razor blade holder designed to keep your blade sharp. Now, let's do some simple math here. If you change your blade every month and sharpen it 10 times per year, that's quite a lot. You've got a pack of 100 blades, right? Okay, so if we multiply the total number of blades by the number of sharpenings each one gets, then divide that result by 12 months in a year... well, you get (100 * 10) / 12 = 83. That's how many years it'll take for all your blades to be used up!